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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Hard X-ray properties of magnetic cataclysmic variables
Monthly Notices of the Royal Astronomical Society, Volume 401, No. 4, Year 2010
Notification
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Description
Hard X-ray surveys have proven remarkably efficient in detecting intermediate polars and asynchronous polars, two of the rarest type of cataclysmic variable (CV). Here, we present a global study of hard X-ray-selected intermediate polars and asynchronous polars, focusing particularly on the link between hard X-ray properties and spin/orbital periods. To this end, we first construct a new sample of these objects by cross-correlating candidate sources detected in INTEGRAL/IBIS observations against catalogues of known CVs. We find 23 CV matches, and also present an additional nine (of which three are definite) likely magnetic cataclysmic variables (mCVs) identified by others through optical follow-ups of IBIS detections. We also include in our analysis hard X-ray observations from the Swift/BAT and SUZAKU/HXD in order to make our study more complete. We find that most hard X-ray-detected mCVs have Pspin/Porb < 0.1 above the period gap. In this respect, we also point out the very low number of detected systems in any band between Pspin/Porb = 0.3 and Pspin/Porb = 1 and the apparent peak of the P spin/Porb distribution at about 0.1. The observational features of the Pspin-Porb plane are discussed in the context of mCV evolution scenarios. We also present for the first time evidence for correlations between hard X-ray spectral hardness and Pspin, Porb and Pspin/Porb. An attempt to explain the observed correlations is made in the context of mCV evolution and accretion footprint geometries on the white dwarf surface. © 2009 RAS.
Authors & Co-Authors
Scaringi, Simone
United Kingdom, Southampton
University of Southampton
Bird, Antony J.
United Kingdom, Southampton
University of Southampton
Norton, Andrew J.
United Kingdom, Milton Keynes
The Open University
Knigge, Christian
United Kingdom, Southampton
University of Southampton
Hill, Adam B.
United Kingdom, Southampton
University of Southampton
France, Saint Martin D'heres
Institut de Planétologie et D’astrophysique de Grenoble Ipag
Clark, David J.
United Kingdom, Southampton
University of Southampton
Dean, Anthony J.
United Kingdom, Southampton
University of Southampton
McBride, Vanessa A.
United Kingdom, Southampton
University of Southampton
Bassani, Loredana
Italy, Bologna
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Bologna
Bazzano, Angela
Italy, Rome
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Rome
Fiocchi, Mariateresa
Italy, Rome
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Rome
Landi, Raffaella
Italy, Bologna
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Bologna
Statistics
Citations: 56
Authors: 12
Affiliations: 5
Identifiers
Doi:
10.1111/j.1365-2966.2009.15826.x
ISSN:
00358711
Study Design
Cross Sectional Study